JP3043178U - Golf club - Google Patents

Abstract

(57) Abstract: A golf club having a stepped shaft having a considerably good envelope strength and having no cavities or cracks. SOLUTION: The head 16 for hitting a ball has a small diameter end connected to the head 16 and a large diameter end for a player to grip. Which have a tubular shape and are connected to each other to form the golf club 10.
And each unit has a smaller diameter as it approaches the small diameter end,
The shaft has a stepped shape by being connected so that the diameter becomes larger toward the large diameter end. Not only does the outer edge of each unit have a stepped shape, but the inner diameter of each unit also decreases as it approaches the small diameter end, and increases as it approaches the large diameter end. Therefore, the effect of blocking the seismic wave becomes more remarkable. At the same time, the stress concentration phenomenon of the shaft can be reduced, and the service life of the golf club 10 can be increased.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a golf club, and more particularly to an improved golf club structure having a stepped shaft.

[0002]

[Prior art]

 Conventional golf clubs are classified according to the material of the shaft, and are generally classified into two types, those made of traditional metal materials and those made of fiber reinforced plastic composite materials. There are generally two types according to the shape of the shaft. One is a cone with the outer diameter from the grip end to the head end of the club decreasing uniformly, and then the shaft has many short cylinders. Each cylinder between the grip end and the head end is installed so that the diameter becomes smaller, so that the appearance of the shaft is stepped.

When making a conical golf club from a fiber reinforced plastic composite material, a piece of fiber woven of suitable length and width and containing many fiber bundles is wrapped around the outer edge of a conical metal rod and then All you have to do is to heat and mold it. However, a golf club having a stepped shaft cannot be manufactured by the above method. The main cause is explained as follows.

According to the above-mentioned manufacturing method, when the shaft of a golf club is to be stepped, the fiber woven piece must be wound around a metal rod having a stepped outer edge, and then heated and fixed. However, when the fiber woven piece is wrapped around a metal rod and the flat inner edge extends over each short column, a gap is formed between the adjacent part of two short columns with different outer diameters and the inner edge of the fiber woven piece. In addition, since a large amount of air accumulates in the gap, the air accumulated in the gap expands during the process of heating the golf club, and the fiber bundles of the shaft are pushed out by the air and the shaft deforms. And once the air bulges out of the shaft, the shaft may rupture or crack after forming. Further, the air that cannot be discharged to the outside forms a cavity inside the golf club after molding, and the strength of the golf club is affected, resulting in nonuniform envelope strength.

[0005]

[Problems to be solved by the device]

 The main object of the present invention is to provide a golf club having a stepped shaft with considerably good envelope strength. Another object of the present invention is to provide a golf club having a stepped shaft without cavitation or cracking.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the golf club of the present invention has a small diameter end and a large diameter end, and it is composed of a large number of units made of a plastic composite material reinforced with some fiber bundles, and each unit is Each of the two straight tubular units has a straight tube having a predetermined weight, extends to a predetermined length by a method of connecting the front and rear along the axis of the straight tubular unit, and optionally the shafts of two adjacent straight tubular units. The diameter of the one that approaches the front end of the club is smaller than that of the one that approaches the rear end of the shaft.Therefore, both the inner diameter and the outer diameter of the club shaft extending from the small diameter end to the large diameter end gradually increase in steps. Be presented to.

[0007]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, as shown in FIGS. 1 to 4, the structure of the golf club 10 according to the first embodiment of the present invention has a small diameter end used for connecting with a head 16 for hitting a ball and a large diameter end for gripping by a player. And is composed of a large number of units 20 extending along the axial direction, each unit 20 being a tubular member having an appropriate length and thickness, which are connected to each other by a golf club. Further, the shafts of the golf club 10 are formed in a stepped manner by connecting the units 20 so that each unit 20 has a smaller diameter toward the small diameter end and a larger diameter toward the large diameter end.

In the manufacture of the shaft of the golf shaft 10, first, the shaft rod 12 whose outer edge is stepped is made, and the fiber bundle 14 having an appropriate width and thickness is spirally formed at a constant pitch. Since the fiber bundle 14 is wrapped around the outer edge and the fiber bundle 14 is wrapped around the shaft rod 12 with an appropriate tension, each fiber bundle 14 is closely attached to the outer edge of the shaft rod 12, and each unit 20 There is no gap in the adjoining part, and each fiber bundle 14 is reciprocally wound around the rod 12 and wound for several layers, and then a shrink film (OPP) is wrapped around the outer edge of the fiber bundle 14 and the When placed in an environment (for example, an oven), the shaft of the golf club 10 is shaped by the thermoplastic or thermosetting resin that is already impregnated in the fiber bundle 14 during the winding process.

A head 16 for hitting a ball is attached to a front end of the golf club 10. When a ball is hit with the head 16, a vibration wave generated in the head 16 is transmitted from a small-diameter end to which the head 16 is attached to a shaft to be gripped by a player. Up to the large diameter end. Since the diameter of the shaft of the golf club 10 is stepwise increased from small to large, it is possible to effectively block a part of the vibration wave and injure the wrist or hand of the player. Reduce the risk of

Not only does the outer edge of each unit 20 have a stepped shape, but the inner diameter of each unit 20 also decreases as it approaches the small diameter end, and increases as it approaches the large diameter end, so both the inner and outer diameters of the shaft are stepped. Therefore, the effect of blocking the seismic wave becomes more remarkable. At the same time, the stress concentration phenomenon of the shaft can be reduced, and the service life of the golf club 10 can be increased.

Further, as shown in FIGS. 4 and 5, the shafts of the golf clubs 10 according to the first and second embodiments of the present invention have the inner diameter r ₁ and the large diameter end of the two adjacent units 20 close to the small diameter end. However, the differences D ₁ and D ₂ of the inner diameter r ₂ can be set to be smaller or larger than the thickness D _{3 of the} rod, respectively, and the former club 10 has better strength and the latter has better reduction. Bring the back effect.

Further, as shown in FIGS. 6 to 8, the golf club 10 according to the third and fourth embodiments of the present invention is provided with a reinforcing layer 17 at a portion which is easily damaged during use. It is a fiber-reinforced composite plastic woven piece with various lengths and widths, which is wound directly on the outer edge of the rod 10 to form a tubular shape. The reinforcing layer 17 may be provided at a small diameter end used for a ball hitting ball of the golf club 10 or a large diameter end used for a player's grip, or may be provided at a middle position of the club 10.

It should be further noted that there are two ways to place the reinforcing layer 17 on the club 10. The axial length of the tubular reinforcing layer 17 is set to be shorter than the length of each corresponding unit 20, and it should not straddle between the two units 20 during the winding process thereof (FIGS. 6 and 7). Therefore, if the golf club 10 is molded, the cavity phenomenon described above can be avoided.

The length of the tubular reinforcing layer 17 in the axial direction is not limited, but it is set so as to straddle the two units 20 adjacent to each other in the winding process (as shown in FIG. 8). When provided, the stress concentration phenomenon of the club 10 can be reduced more effectively and the service life thereof can be increased. However, in the case of straddling the two units 20, in order to avoid the occurrence of the above-mentioned hollow phenomenon, after the winding of the tubular reinforcing layer 17 is completed, the fiber bundle 14 is wound before or after the winding. First of all, a suitable pressure is first applied to the outer edge of the reinforcing layer 17 so that the inner edge of the reinforcing layer 17 adheres tightly to the outer edge of the rod 12 so that the above-mentioned cavitation phenomenon is avoided. However, since the process of attaching the reinforcement layer 17 to the outer edge of the rod 12 must be performed manually, it can be applied only to a small range of reinforcement and is not suitable for being installed on the inner edge envelope of the golf club 10.

In addition to this, when the fiber bundle 14 is wound around the shaft rod 12, it reciprocates and continuously winds several layers, so that the manufactured golf club 10 can have uniform strength. However, each fiber bundle 14 is divided into a group of first fiber bundles 141 and a group of second fiber bundles 142 sandwiching + α and −α with the axis of the shaft rod 12, respectively, and as shown in FIGS. 9, 10 and 11. The first and second fiber bundles 141 and 142 can be jointly braided into the long tubular net 18, and can be directly attached to the outer edge of the rod 12. At the time of production, a heat-shrinkable film is covered on the outside of the long net 18 which is assembled to the rod 12 (not shown in the drawing), and it is placed in a high temperature environment (for example, an oven) to shrink. At the same time that the membrane is uniformly contracted, the long net 18 is tightly attached to the outer edge of the rod 12 so that the golf club 10 has a step shape inside and outside. Further, the reinforcing layer 17 may be installed at each of the large diameter end and the small diameter end of the golf club 10, and the reinforcing layer 17 is formed into a tubular shape by the above-described winding method, or is a long tube that is already in a tubular shape. A mesh 18 may be used to form the reinforcing layer 17 by incorporating it into the inner edge of the shaft, and the length of the reinforcing layer 17 formed from the long tubular mesh 18 is shorter than the length of each corresponding unit 20. To do.

Further, after the long tubular net 18 is attached to the outer edge of the shaft rod 12, the first and second fiber bundles 141 and 142 located at the large diameter end are subjected to the enlargement at the large diameter end. The included angle of the rod 12 with the shaft is increased to ± β, and the included angle between the first and second fiber bundles 141 and 142 located at the small diameter end and the shaft of the rod 12 is ± α, which results in the golf club. The bush 10 can have a higher anti-bending ability than the small diameter end and the large diameter end without any special treatment.

As shown in FIG. 12, the golf club 10 according to the sixth embodiment of the present invention uses both the basic structure of winding the fiber bundle 14 and assembling the long net 18 onto the rod, and A heat shrinkable mesh may also be used together, whereby the shaft of the golf club 10 can have a step-like shape on both the inner and outer edges. When such a structure is adopted, it is preferable that the weaving layer formed by the long tubular net 18 is provided outside the winding layer, which makes the appearance more orderly and aesthetically pleasing.

Further, a reinforcing layer 17 may be applied to the golf club 10 composed of two layers of fiber bundles 14 having different organizational systems, and one unit 20 among them has the reinforcing layer 17 wound around it. Alternatively, in addition to forming the long tubular net 18 directly into a tubular shape, it may be provided as the innermost layer of the golf club 10 or may be interposed between the winding layer and the long tubular net according to the manufacturer's demand. .

In addition to the above, as for the unit 20, each unit in the golf club 10 is, of course, better to be provided in a hollow tubular shape for reducing the weight thereof, but in addition to the unit shown in FIG. It may be provided in a conical shape as shown at 13, and may be provided with two adjacent conical tubular units 20 as shown in FIGS. 4 and 5 with a difference in their diameters.

[Brief description of the drawings]

FIG. 1 is a perspective view of a first embodiment of the present invention.

FIG. 2 is a structural view of the first embodiment of the present invention.

FIG. 3 is a schematic cross-sectional view taken along line 3-3 of FIG. 1 of the first embodiment of the present invention.

FIG. 4 is a schematic cross-sectional view taken along line 4-4 of FIG. 1 of the first embodiment of the present invention.

FIG. 5 is a sectional front and back view of the second embodiment of the present invention taken along the axial direction.

FIG. 6 is a structural view of the third embodiment of the present invention.

FIG. 7 is a schematic cross-sectional view taken along line 7-7 of FIG. 6 according to the third embodiment of the present invention.

FIG. 8 is a structural view of the fourth embodiment of the present invention.

FIG. 9 is a perspective view of a fifth embodiment of the present invention.

10 is a cross-sectional view of the fifth embodiment of the present invention taken along the line 10-10 of FIG.

FIG. 11 is a schematic sectional view taken along line 11-11 of FIG. 9 of the fifth embodiment of the present invention.

FIG. 12 is a structural schematic diagram of a sixth embodiment of the present invention.

FIG. 13 is a structural view of the seventh embodiment of the present invention.

[Explanation of symbols]

 10 Golf Club 12 Axle 14 Fiber Bundle 16 Head 17 Reinforcing Layer 18 Long Tube Net 20 Each Unit

Claims (15)

[Utility model registration claims] 1. A composition comprising a large number of units made of a plastic composite material having a small diameter end and a large diameter end and reinforced with a slight fiber bundle, each unit having a predetermined thickness. The diameter of a straight tubular unit that extends to a predetermined length by a method of connecting longitudinally along its axis and that is adjacent to the front end of its shaft in two adjacent straight tubular units. Is smaller than the diameter of the shaft that is close to the rear end of the shaft, and the inner and outer diameters of the shaft extending from the small-diameter end to the large-diameter end are gradually stepped so that the golf club has a step-like shape. 2. A plurality of units made of fiber reinforced plastic composite material, each unit having a conical tubular shape with a predetermined thickness, and connected in the front-rear direction along the axis thereof. The planned length is stretched,
Also, the diameter of the portion of each conical tubular unit near the club tip is smaller than the diameter of the portion near the rear end of the club, and the outer diameter extends from the small-diameter end to the large-diameter end. A golf club characterized by being able to be presented one after another. 3. The difference between the inner diameters of two adjacent units is smaller than the thickness of each unit.
Or the golf club according to 2. 4. The difference between the inner diameters of two adjacent units is larger than the thickness of each unit.
Or the golf club according to 2. 5. The reinforcing fiber bundle in each unit is presented in a spiral shape and is stretched, and is reciprocally wound at a predetermined pitch along the axis of the club and wound in several layers. The golf club according to 1 or 2. 6. The reinforcing fiber bundles in each unit are divided into at least a group of first fiber bundles and a group of second fiber bundles sandwiching a predetermined angle from the axis of the club, and the first and second fiber bundles. 3. The golf club according to claim 1 or 2, wherein the knitting and weaving methods jointly form a long tubular weaving layer. 7. The sandwich angle between the first and second fiber bundles located at the small diameter end of the club and the shaft of the club is between the first and second fiber bundles located at the large diameter end of the club and the shaft of the club. 7. The golf club according to claim 6, wherein the golf club has a smaller angle. 8. A part of the fiber bundle in each unit is formed in a winding layer wound along its axis in a spiral manner at a predetermined pitch, and another part is formed in a long tubular shape by a weaving method. The golf club according to claim 1 or 2, wherein the golf club is formed in a weaving layer. 9. A reinforcing layer is included, said reinforcing layer being tubular and provided on the inner edge of a unit, the axial length of which is shorter than the length of the corresponding unit, between the two units. 2. It does not cross over.
Or the golf club according to 2. 10. A reinforcing layer is included, the reinforcing layer presenting a tubular shape of a predetermined length and wrapping around an outer edge of an adjacent portion of two adjacent units. The golf club according to 1 or 2. 11. The reinforcement layer is a fiber-reinforced plastic composite material in the form of a woven piece having a predetermined length and width, and is formed into a tubular shape which is located in the innermost layer of the club by a winding method. The golf club according to claim 9. 12. The reinforcing layer is a fiber-reinforced plastic composite material having a predetermined length and width, and is formed into a tubular shape positioned at the innermost layer of the club by a winding method. The golf club according to claim 10. 13. The golf club according to claim 10, wherein the reinforcing layer is a long net formed by a weaving method with a few fiber bundles. 14. A part of the fiber bundle in each unit is wound along its axis by a spiral method to form a winding layer, and another part is formed by a knitting method to form a long tubular mesh-like weaving layer. And at least one unit of the club is tubular and has an axial length that is shorter than the length of the reinforcing layer of the unit. 15. The golf club according to claim 14, wherein the reinforcing layer is interposed between each winding layer and the weaving layer.